Abstract: :
Purpose: The OCT/SLO combines the confocal imaging capability of thescanning laser ophthalmoscope (SLO) with the tomographic scanningability of optical coherence tomography (OCT). It is able togenerate precisely registered OCT images in both longitudinal(B–scan) and coronal (C–scan) orientation, providingmultidimensional retinal imaging. Previous studies have describedthe imaging characteristics of Idiopathic Polypoidal ChoroidalVasculopathies (IPCV) using conventional longitudinal OCT scans.The purpose of this study is to describe additional featuresof this disease entity revealed by coronal scanning using theOCT/SLO.Methods: A retrospective review of cases imaged with the OCT/SLO betweenJanuary and November 2004 found 4 cases of IPCV whose diagnosiswas confirmed by ICG. Coronal images from each of these caseswere reviewed and superimposed upon corresponding ICG angiogramsusing Adobe Photoshop. The correlations between the anatomicchanges seen in the OCT images and the choroidal vascular featuresrevealed by ICG were studied .Results: RPE appearance was found to be more irregular and oftentimesmottled over the area of choroidal vascular dilatation and branching.RPE elevations seen in the longitudinal views appeared in coronalsections as bright (hyperreflective) circles within the deeperlayers of the retina. When superimposed upon the ICG images,the smaller of these circular lesions appeared to correspondto areas of polypoidal dilatation, while the larger circularlesions seemed to correspond to RPE detachments, frequentlyadjacent to clear areas thought to represent subretinal fluidaccumulation.Conclusions: Coronal OCT scanning more completely characterized the configurationand extent of the RPE abnormalities than was possible with longitudinalOCT imaging alone. These features could be easily referencedICG angiograms since they shared a common planar perspective.Coronal OCT imaging may prove to be a valuable addition to clinicaltools currently available for the in the evaluation of idiopathicchoroidal polypoidal vasculopathy.